Magnesium test cost in Fresno, CA — inpatient
In Fresno, CA, 3 hospitals list a cash price for magnesium blood test as an inpatient: from $120.40 to $140.00, with a median of $140.00. The lowest listed price is at Kaiser Foundation Hospital - Fresno — $19.60 less than the median here. Across California, the median is $106.08 at 103 hospitals.
Cash prices at 3 facilities across 2 cities for code 83735, as an inpatient (admitted to hospital) . Collected Sep 24, 2026; the hospital files themselves were last updated between Jun 15, 2026 and Jun 18, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Fresno, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Kaiser Foundation Hospital - Fresno lowest Fresno, CA · (559) 448-4500 ASSAY OF MAGNESIUM | $120.40 | $215.00 | $6.00–$20.00 | 44% | — source file |
| Fresno Community Hospital and Medical Center Clovis, CA · (559) 324-4000 MAGNESIUM SERUM | $140.00 | $175.00 | $44.63–$192.50 | 20% | Jun 15, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM SERUM | $140.00 | $175.00 | $44.63–$192.50 | 20% | Jun 18, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM SERUM | $140.00 | $175.00 | $44.63–$192.50 | 20% | Jun 18, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM SERUM | $140.00 | $175.00 | $44.63–$192.50 | 20% | Jun 16, 2026 source file |
| Fresno Community Hospital and Medical Center Clovis, CA · (559) 324-4000 MAGNESIUM URINE 24 HOUR | $146.10 | $182.62 | $46.57–$200.88 | 20% | Jun 15, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM URINE 24 HOUR | $146.10 | $182.62 | $46.57–$200.88 | 20% | Jun 16, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM URINE 24 HOUR | $146.10 | $182.62 | $46.57–$200.88 | 20% | Jun 18, 2026 source file |
| Fresno Community Hospital and Medical Center Fresno, CA · (559) 459-6000 MAGNESIUM URINE 24 HOUR | $146.10 | $182.62 | $46.57–$200.88 | 20% | Jun 18, 2026 source file |
Inpatient: lowest $120.40, median $140.00, highest $140.00 — a 1.2× difference within the same market.
As an outpatient, the same code is billed by 4 facilities here, median $122.40 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 3 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What it is
A magnesium test measures the level of magnesium in the blood. Doctors order it for muscle cramps or weakness, an irregular heartbeat, low potassium or calcium that does not correct, and for people on diuretics, long-term acid-reducing drugs or with kidney disease.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.